diff --git a/test/Project.toml b/test/Project.toml
index e30e2ba..4a5dd1b 100644
--- a/test/Project.toml
+++ b/test/Project.toml
@@ -19,3 +19,4 @@ UnitfulAstro = "6112ee07-acf9-5e0f-b108-d242c714bf9f"
 
 [compat]
 StableRNGs = "1"
+Unitful = "1.28.0"